Projection arrangement

ABSTRACT

In a projection arrangement comprising a light source ( 1 ) for generating a luminous field ( 2 ), a reflecting light modulator ( 4; 27 ) onto which light coming from the luminous field ( 2 ) may be directed, said light being modulated by the light modulator ( 4; 27 ) in order to generate an image, and further comprising projection optics ( 5; 21, 32 ), arranged following the light modulator, for projecting said image, the projection optics ( 5; 21, 32 ) comprise imaging optics ( 5; 21 ) including a mirror ( 9, 25 ) and a lens ( 6; 7; 8; 22; 23; 24 ) arranged between the light modulator ( 4; 27 ) and the mirror ( 9; 25 ), the light coming from the light modulator ( 4; 27 ) and reflected by the mirror ( 9; 25 ) passing twice through the lens ( 6; 7; 8; 22; 23; 24 ) and the light coming from the luminous field ( 2 ), which is directed onto the light modulator ( 4; 27 ), passing through the lens ( 6; 7; 8; 22; 23, 24 ) of the imaging optics ( 5; 21 ) only once.

[0001] The invention relates to a projection arrangement comprising alight source for generating a luminous field, a light modulator ontowhich light coming from the luminous field may be directed, said lightbeing modulated by the light modulator in order to generate an image,and further comprising projection optics arranged following the lightmodulator for projecting said image.

[0002] A projection arrangement of this type is known, for example fromDE 198 32 317 B1; in said projection arrangement, however, the lightcoming from the luminous field is deflected by means of a prism so as toilluminate the light modulator. For this purpose, the prism needs to belocated very close to the optical elements of the projection optics,which makes the structure, in particular the support of the individualoptical elements, very difficult to realize. Further, said projectionoptics require a multiplicity of lenses, resulting in complexmanufacture and in a heavy weight of the arrangement.

[0003] In view thereof, it is an object of the invention to improve aprojection arrangement of the aforementioned type such that itsstructure is simplified.

[0004] In a projection arrangement of the aforementioned type, saidobject is achieved in that the projection optics comprise imaging opticshaving a mirror and at least one lens arranged between the lightmodulator and the mirror, wherein the light coming from the lightmodulator and reflected by the mirror passes twice through said at leastone lens and wherein the light coming from the luminous field anddirected onto the light modulator passes only once through said at leastone lens of the imaging optics. The imaging optics may comprise one oreven several lenses.

[0005] Since the light which comes from the light modulator and isincident on the mirror passes twice through the at least one lens of theimaging optics, the number of lenses in the projection arrangementaccording to the invention is reduced. This has the advantage that theweight of the projection optics is reduced and also that the manufactureof the projection arrangement according to the invention can be effectedmore quickly and more economically.

[0006] Furthermore, the folding of the optical path in the imagingoptics due to the mirror also leads to a reduced expanse of the imagingoptics along their optical axis, thus also allowing the projectionarrangement according to the invention to be realized in a more compactmanner.

[0007] Because the at least one lens, through which the light comingfrom the luminous field passes, images the luminous field onto the lightmodulator or at least contributes to said imaging, the number of opticalelements required for illumination of the light modulator decreases,thus enabling a further reduction in the number of optical elements inthe projection arrangement according to the invention, which leads to areduction in weight and to lower costs.

[0008] In a preferred embodiment of the projection arrangement accordingto the invention, the imaging optics are provided as 1:1 imaging optics.This has the advantageous effect that a small image having the same sizeas the imaging area of the light modulator may be generated by means ofthe imaging optics. Also, in 1:1 imaging optics, the imaging propertiesof the curved mirror are particularly good.

[0009] In particular, the imaging optics of the projection arrangementaccording to the invention may be symmetrical with regard to the mirror.This leads to the very important advantage that the transverse chromaticaberration is practically zero and thus not present. In an advantageousembodiment of the projection arrangement according to the invention, themirror of the imaging optics is curved. Providing the imaging opticswith the curved mirror, which folds the optical path in the imagingoptics, allows the light coming from the luminous field to reach thelight modulator, without deflection by means of a prism, through the atleast one lens of the imaging optics, so that, on the one hand, afurther reduction in the number of optical components is made possibleand, on the other hand, the dimension of the arrangement according tothe invention can be reduced.

[0010] Since the mirror of the imaging optics of the projectionarrangement according to the invention is curved, it causes not onlyfolding of the optical path in the imaging optics, but also contributesto the imaging of the imaging area of the light modulator, thus enablinga further reduction in the number of lenses arranged between the mirrorand the light modulator. Thus, for example, imaging optics comprisingonly three lenses and a curved mirror have excellent imaging properties,which can be achieved in imaging optics without a curved mirror only bya much greater number of lenses.

[0011] The mirror of the imaging optics in the projection arrangementaccording to the invention preferably has a spherical curvature. In thiscase, manufacture of the mirror is easily possible, allowing to provideeconomical imaging optics and, thus, also an economical projectionarrangement.

[0012] An advantageous embodiment of the projection arrangementaccording to the invention consists in that illumination optics arearranged between the luminous field and the imaging optics and aredesigned such that the luminous field is imaged onto the light modulatorvia the illumination optics and the at least one lens of the imagingoptics. Thus, the at least one lens of the imaging optics isadvantageously used also as the lens of the illumination optics, so thatthe number of optical elements of the illumination optics may bereduced. This leads to smaller and lighter illumination optics and alsohas the advantage that it is more economical as a result.

[0013] In particular, the light coming from the illumination optics maybe coupled into the imaging optics directly (without deflection), sothat advantageously no deflecting elements are required and theprojection arrangement can be realized in a compact manner.

[0014] In a preferred embodiment of the projection arrangement accordingto the invention, the imaging optics comprise an optical axis, the lightmodulator is arranged below an imaginary reference plane, in which saidoptical axis extends, and the image generated by the imaging optics isgenerated above the reference plane. In doing so, the imaging area ofthe light modulator is preferably arranged symmetrically, with regard tothe reference plane, relative to the image imaged by the imaging optics,so that the optical path of the modulated light reflected by the lightmodulator also extends through the imaging optics symmetrically relativeto said reference plane, which ensures excellent imaging properties.

[0015] An advantageous embodiment of the arrangement according to theinvention consists in that the luminous field and, thus, also theillumination optics may be located either above or below the referenceplane. Thus, the luminous field and the illumination optics may bearranged, depending on further general conditions, e.g. the givendimensions of the housing of the projection arrangement according to theinvention, such that the projection arrangement according to theinvention may be designed to be very flexible in its spatialarrangement.

[0016] Moreover, the light modulator of the projection arrangementaccording to the invention may be a tilting mirror matrix. Such atilting mirror matrix may comprise, for example, a multiplicity oftilting mirrors arranged in lines and columns which are independentlytiltable into first and second positions, wherein, in the case of thearrangement according to the invention, the light reflected by thetilting mirrors in the first position (bright image points) impinges onthe curved mirror and the light reflected by the tilting mirrors in thesecond position (dark image points) does not impinge on the curvedmirror, but travels past it, or is cut off before. This allows theinvididual image points to be brightened or darkened, so that the lightreflected by the tilting mirror matrix is modulated and, thus, thedesired image may be generated, in this sense, on the tilting mirrormatrix (the light for the brightened and for the darkened image pointsis reflected or radiated by the tilting mirror matrix in differentdirections). Since the tilting mirror matrix reflects the entire lightimpinging on the corresponding tilting mirrors for the brightened imagepoints, a very bright image may be generated with few losses due to thelight modulator.

[0017] It is also possible to direct different colors, such as red,green and blue, onto the light modulator in a time-sequential manner, sothat the light modulator allows to generate partial color images, whichare rapidly projected in succession, so that a multi-color image isperceivable. In order to generate the different colors, a known colorwheel may be used, upon which light from the light source is directedand which, due to different color filters of the color wheel, transmitsonly light of the desired color according to its rotary position.

[0018] Further, the projection arrangement according to the inventionmay be embodied such that the light source emits multicolor light, thata color unit is arranged between the imaging optics and the lightmodulator and that a second light modulator is arranged following thecolor unit, wherein it is possible to direct light from the luminousfield onto the color unit via the imaging optics from which the colorunit couples out light of a first color and directs it onto the firstlight modulator and couples out light of a second color and directs itonto the second light modulator, wherein the light modulators modulatethe light impinging on them in order to generate one partial color imageeach, and wherein the modulated light is superimposed by the color unitto form one common beam and is guided to the imaging optics. The imagingoptics image the superimposed partial color images together, so that,advantageously, a color image may be generated.

[0019] In particular, a third light modulator, arranged following thecolor unit, may be additionally provided in the projection arrangementaccording to the invention, wherein the color unit couples light of athird color out of the light which is incident on it and directs saidlight onto the third light modulator, which modulates the light incidentthereon, so as to generate a third partial color image, and wherein thelight modulated by the third light modulator is superimposed, by meansof the color unit, on the light modulated by the other light modulatorsto form one common beam. Providing three light modulators allows threepartial color images of different colors to be generated, so that theimaged multicolor image may contain any desired colors. Further, a highbrilliance of colors is easy to realize as well. In this case, it isparticularly preferable if a red partial color image may be generatedusing the first light modulator, a green partial color image may begenerated using the second light modulator and a blue partial colorimage may be generated using the third light modulator.

[0020] A preferred embodiment of the projection arrangement according tothe invention consists in that the projection optics further comprise aprojection unit arranged following the imaging optics, said projectionunit, together with the imaging optics, projecting the image generatedby means of the light modulator onto a projection surface. In this case,the imaging optics generate a real intermediate image, which is thenprojected onto the projection surface by means of the projection unit.Since the projection unit may be arranged immediately following thegenerated real intermediate image, the required intercept distance ofthe projection unit is very small, so that its structure may be simple.

[0021] Furthermore, the projection unit may also be designed andconceived to be completely independent from the imaging optics, becauseit has to image the real intermediate image, and not the image generatedon the light modulator(s) nor the imaging areas of the light modulators,onto the projection surface.

[0022] Thus, in the projection arrangement according to the invention,an adaptation to different applications, such as a wide-angle projectionor a projection wherein the optical axis of the projection unit enclosesan angle with the projection surface which does not equal 900, may bevery easily realized by providing one projection unit each adapted tothe respective application.

[0023] If the imaging optics are 1:1 imaging optics or also reducingimaging optics, the real intermediate image generated is very small,allowing the lens diameter of the lenses in the projection unit to bekept small, too. Advantageously, this leads to a very compact, small andlight projection unit.

[0024] The projection arrangement according to the invention may also beembodied such that the projection optics only comprise the imagingoptics. In this case, an extremely compact projection arrangement istprovided, using which, preferably, 1:1 imaging of an image adjusted on alight modulator or of the imaging area of said light modulator may berealized.

[0025] As the light modulator, a reflective LCD module may also be used,in which case linearly polarized light of a first polarization directionis to be directed onto the light modulator. The LCD module comprises amultiplicity of image pixels, which are independently controllable andleave the polarization direction of the light reflected by themunchanged or turn it by 90°.

[0026] Therefore, an analyzer is further provided, through which thelight reflected by the LCD module has to pass and which transmits onlylinearly polarized light of a predetermined polarization direction tothe intermediate image, so that the polarization-modulated image, whichis adjusted on the LCD module, is divided by the analyzer intobrightened and darkened image points. In the projection arrangementaccording to the invention, there is also preferably provided a controlunit which controls the light modulator(s) on the basis of predeterminedimage data so as to modulate the light incident on the lightmodulator(s) accordingly and thus generate the corresponding images.

[0027] The invention will be explained in more detail below, by way ofexample, with reference to the drawings, wherein:

[0028]FIG. 1 shows a sectional view of a first embodiment of theprojection arrangement according to the invention;

[0029]FIG. 2 shows a sectional view of a second embodiment of theprojection arrangement according to the invention, and

[0030]FIG. 3 shows a sectional view of a third embodiment of theprojection arrangement according to the invention.

[0031] As is evident from FIG. 1, the projection arrangement of theinvention, according to the first embodiment, comprises a light source1, which preferably emits white light by means of which a luminous field2 may be generated, illumination optics 3 arranged following theluminous field 2 for directing the light coming from the luminous field2 onto the light modulator 4, and imaging optics 5 arranged between theillumination optics 3 and the light modulator 4.

[0032] The imaging optics 5 comprise three lenses 6, 7 and 8 and acurved mirror 9 and serve to image an image generated on the lightmodulator 4 under the control of a control unit 10 on the basis ofpredetermined image data into an image plane 11.

[0033] The light modulator 4 contains a cover glass 12 and a tiltingmirror matrix 13 arranged behind the latter, said tilting mirror matrix13 comprising a plurality of tilting mirrors arranged in lines andcolumns, which may be tilted at least from a first to a second tiltedposition independently of each other. In the embodiment shown, theprojection arrangement is designed such that light reflected by thetilting mirrors being in the first position impinges on the curvedmirror 9, while light reflected by the tilting mirrors being in thesecond position is guided around the curved mirror 9. Thus, the tiltingmirrors in the first tilted position allow to generate brightened imagepoints and the tilting mirrors in the second tilted position allow togenerate darkened image points. Accordingly, the light reflected by thetilting mirror matrix is modulated in terms of the angle of reflectionof the light bundles coming from the tilting mirrors and, in this sense,an image is generated on the tilting mirror matrix, said image beingimaged into the image plane 11, which may be an intermediate image planeor also a projection surface, by means of the imaging optics 5.

[0034] By way of example, FIG. 1 shows optical paths of the light comingfrom the luminous field 2, presuming that said light is reflected by thecorresponding tilting mirrors of the tilting mirror matrix 13 in such away that it impinges on the curved mirror 9 (light of the brightenedimage points).

[0035] As is evident from FIG. 1, the light coming from the luminousfield 2 passes through the illumination optics 3, which comprise firstand second lenses 14, 15, and then through the lenses 8, 7 and 6 of theillumination optics 3, and then impinges on the tilting mirror matrix 13after having passed through the cover glass 12. The incident light isreflected by the tilting mirror matrix 13 and passes through the lenses6, 7 and 8 again, and impinges on the curved mirror 9, which reflectsthe light such that it passes through the lenses 8, 7 and 6 again and areal image of the image adjusted on the tilting mirror matrix isgenerated in the image plane 11. Thus, the optical path in the imagingoptics 5 is Z-shaped. A cover glass 16 is arranged in front of the imageplane 11 so that the imaging effected by the imaging optics 5, which, inthis case, are 1:1 imaging optics, is symmetrical.

[0036] The exact design of the imaging optics 5 is evident from Table 1below, wherein D is the distance between the corresponding effectivesurfaces (along the optical axis OA1), n is the refractive index and isthe Abbe dispersion number: TABLE 1 Surface Radius between the number ofcurvature (mm) surfaces D (mm) n v  13 ∞  13-101 0.76 1.000000 101 ∞101-102 3.00 1.489144 70.23 102 ∞ 102-103 29.64 1.000000 103 ∞ 103-10419.00 1.489144 70.23 104 −111.67618 104-105 3.53 1.000000 105  237.40174 105-106 22.53 1.489144 70.23 106 −131.61016 106-107 25.351.000000 107   124.28582 107-108 20.00 1.624081 36.11 108    96.40134108-109 41.66 1.000000 109 −161.74108

[0037] The tilting mirror matrix 13 and the image plane 11 are locatedin one common plane, which is perpendicular to the optical axis OA1. Thesame goes for the surface 101 of the cover glass 12 and for the surfaceof the cover glass 16 facing the image plane 11, as well as for thesurface 102 and the surface of the cover glass 16 turned away from theimage plane 11. Therefore, the distance D in the above Table 1 for thesurfaces 13, 101 and 102 is always the distance of the points ofintersection of the corresponding planes with the optical axis OA1.

[0038] The design of the illumination optics 3 is evident from Table 2below, wherein the lens vertex of the effective surface 110 of the lens14 is located, relative to the vertex of the mirror 9, on a verticalline passing through the vertex of the mirror 9 to the optical axis OA1of the imaging optics 5, and the distance from the lens vertex of theeffective surface 110 to the optical axis OA1 of the imaging optics 5 is32.42 mm. Further, the optical axis OA2 of the illumination optics 3 isinclined at 2.80 relative to the optical axis OA1 of the imaging optics5 (in this case, D refers to the distance along the optical axis OA2).TABLE 2 Radius of between the Surface number curvature surfaces D (mm) nv 110    59.75744 110-111 9.00 1.518251 63.9 111  −77.70133 111-11232.36 1.000000 112    23.54345 112-113 8.10 1.518251 63.9 113  230.44082 113-2  20.47 1.000000

[0039]FIG. 2 shows a modification of the projection arrangementaccording to the invention as shown in FIG. 1, wherein the illuminationoptics 17, as viewed in FIG. 2, are now arranged above the optical axisOA1 of the imaging optics 5, in contrast to the embodiment of FIG. 1,while the light modulator 4, as viewed in FIG. 2, is located below theoptical axis OA1, so that light coming from the luminous field 2 passesthrough the lenses 8, 7 and 6 of the imaging optics 5 and, in doing so,crosses the optical axis OA1 of the imaging optics 5.

[0040] Due to the position of the illumination optics 17 relative to theimaging optics 5 and to the light modulator 4, the required lensdiameter of the lenses 6 to 8 of the imaging optics 5 is smaller, as isevident, for example, from a comparison of FIGS. 1 and 2, thus enablinga further weight reduction.

[0041] In the embodiment shown in FIG. 2, identical elements are denotedby the same reference numerals as in FIG. 1 and for description thereof,reference is made to the corresponding description of FIG. 1.

[0042] Except for the lens diameter in the imaging optics 5 of FIG. 2,the optical elements are identical with those of the imaging optics 5shown in FIG. 1; therefore, in connection with the structure of theimaging optics shown in FIG. 5, reference is made to Table 1. Thestructure of the illumination optics 17 is evident from Table 3 below,wherein the lens vertex of the effective surface 114 of the lens 14 islocated on a line passing through the vertex of the mirror 9perpendicular to the optical axis OA1 of the imaging optics 5, and thedistance from the lens vertex of the effective surface 114 to theoptical axis OA1 is 33.35 mm. Further, the optical axis OA3 of theillumination optics 17 is inclined at 140 relative to the optical axisOA1 of the imaging optics 5 (in this case, D refers to the distancealong the optical axis OA3). TABLE 3 Surface Radius of between thenumber curvature surfaces D (mm) n v 114    70.63460 114-115 8.801.612602 61.02 115  −71.78678 115-116 28.59 1.000000 116    27.96607116-117 11.40 1.612602 61.02 117 −499.90085 117-2  16.42 1.000000

[0043]FIG. 3 shows a further embodiment of the projection arrangementaccording to the invention, which again comprises a light source 1,preferably emitting white light by means of which a luminous field 2 isgenerated, illumination optics 20, and imaging optics 21 arrangedfollowing the illumination optics 20, said imaging optics 21 comprisinglenses 22, 23, 24 and a curved mirror 25. The 1:1 imaging optics 21 arefollowed by a color unit 26, which divides the white light incidentthereon into its red, green and blue components, with the green colorcomponent, as viewed in FIG. 1, passing through the color unit 26 to theleft and impinging on a light modulator 27 arranged there, and the redand blue components each being deflected perpendicular to the drawingplane (once into the drawing plane and once out of the drawing plane)and impinging on correspondingly provided light modulators (not shown).Each of said light modulators 27 is a tilting mirror matrix 28 with acover glass 29 applied thereon.

[0044] The light modulators 27 modulate the light impinging on them suchthat one partial color image each is generated on the three lightmodulators, the modulated light being reflected back to the color unit26, by which it is superimposed to form one common beam which impingeson the imaging optics 21 and, in doing so, passes through the lenses 22to 24, is reflected by the curved mirror 25 and, again, passes throughthe lenses 24 to 22, and then impinges on a glass block 30 and a glassplate 31 arranged following the lens 22, and passes through them, sothat a real color image of the superimposed partial color images fromthe light modulators 27 is generated in the image plane 11 following theglass plate. A projection unit 32, which projects the real imagegenerated in the image plane 11 onto a projection surface 33, isarranged following the image plane 11.

[0045] In the embodiment shown in FIG. 3, the light modulators 27 (ofwhich only one is shown in the Figure) are also arranged such that thelight reflected by the tilting mirrors in the first position impinges onthe mirror 25 and is, thus, used for the brightened image points,whereas the light reflected by the tilting mirrors in the secondposition is passed around the mirror 25, thus allowing to adjust thedarkened image points.

[0046] Instead of the glass block 30 and the glass plate 31, which areprovided so that the optical path length from the light modulator 27 tothe mirror 25 equals the optical path length from the mirror 25 to theintermediate image plane 11, there may also be provided a deflectingprism, in turn followed by the projection unit 32, so that projection iseffected in another (freely selectable) direction.

[0047] The exact structure of the imaging optics 21 and of theillumination optics 20, comprising the lenses 34 and 35, is shown inTables 4 and 5 below.

[0048] The illumination optics 20 are arranged such that the distancefrom the vertex of the effective surface 130 to the lens 34perpendicular to the optical axis OA3 of the imaging optics 21 is 27.113mm and is offset by 6.0 mm in the direction toward the light modulator27, relative to the vertex of the mirror 25, along the optical axis OA3of the imaging optics 21, with the optical axis OA4 of the illuminationoptics 20 being inclined at 11.87° relative to the optical axis OA3 ofthe imaging optics 21.

[0049] Tables 4 and 5 show the distances D along the correspondingoptical axes, indicating, as regards the surfaces 133-2, the distancefrom the surface 133 to the point of intersection P of an imaginaryprolongation of the surface 2, shown as a linear shape in FIG. 3, withthe optical axis OA4. In this case, the surface 2 is tilted at 18°relative to a vertical to the optical axis OA4, with the distance of theedge points R1 and R2 of the surface 2 (FIG. 3) perpendicular to theoptical axis OA4 being 7.32 mm and 17.62 mm. TABLE 4 Surface Radius ofbetween the number curvature (mm) surfaces D (mm) n v  28 ∞  13-119 0.51.000000 119 ∞ 119-120 3.00 1.510452 60.98 120 ∞ 120-121 2.54 1.000000121 ∞ 121-122 30.00 1.518722 63.96 122 ∞ 122-123 5.00 1.000000 123289.85 123-124 16.00 1.655687 44.67 124 −97.579 124-125 17.11 1.000000125 176.861 125-126 12.30 1.518722 63.96 126 −132.09 126-127 24.221.000000 127 −1112.0 127-128 15.00 1.550987 45.47 128 155.641 128-12914.76 1.000000 129 −128.878

[0050] TABLE 5 Radius of between the Surface number curvature surfaces D(mm) n v 130 31.823 130-131 9.10 1.489144 70.23 131 −430.7 131-132 9.001.000000 132 21.803 132-133 12.00 1.591424 61.02 133 28.717 133-2  33.681.000000

[0051] The color unit 26 shown in FIG. 3, which comprises 3 lightmodulators, may, of course, be used also in the embodiments shown inFIGS. 1 and 2 in order to generate color images in the image plane 11.Further, it is also possible, according to the embodiments shown inFIGS. 1 and 2, to arrange respective projection optics following theimage plane 11, so that the image plane 11 is an intermediate imageplane in which a real intermediate image is generated, which is thenimaged (in enlarged or reduced form) onto a projection surface by meansof the projection optics.

1. A projection arrangement comprising a light source (1) for generatinga luminous field (2), a reflecting light modulator (4; 27) onto whichlight coming from the luminous field (2) may be directed, said lightbeing modulated by the light modulator (4; 27) in order to generate animage, and further comprising projection optics (5; 21, 32), arrangedfollowing the light modulator, for projecting said image, characterizedin that the projection optics (5; 21, 32) comprise imaging optics (5;21) including a mirror (9, 25) and a lens (6; 7; 8; 22; 13; 24) arrangedbetween the light modulator (4; 27) and the mirror (9; 25), the lightcoming from the light modulator (4; 27) and reflected by the mirror (9;25) passing twice through the lens (6; 7; 8; 22; 23; 24) and the lightcoming from the luminous field (2), which is directed onto the lightmodulator (4; 27), passing through the lens (6; 7; 8; 21; 22; 23) of theimaging optics (5; 21) only once.
 2. The projection arrangement asclaimed in claim 1, characterized in that the imaging optics (5; 21) are1:1 imaging optics.
 3. The projection arrangement as claimed in claim 1or 2, characterized in that the imaging optics (5; 21) are symmetricalwith respect to the mirror (9; 25).
 4. The projection arrangement asclaimed in any one of claims 1 to 3, characterized in that the mirror(9, 25) of the imaging optics (5; 21) is curved.
 5. The projectionarrangement as claimed in claim 4, characterized in that the mirror (9;25) has a spherical curvature.
 6. The projection arrangement as claimedin any one of claims 1 to 5, characterized in that illumination optics(3; 17; 20) are provided between the luminous field (2) and the lens (6;7; 8; 22; 23; 24) of the imaging optics (5; 21), which are designed suchthat the luminous field (2) is imaged onto the light modulator (4; 27)via the illumination optics (3; 17; 20) and the lens (6; 7; 8; 22; 23,24) of the imaging optics (5; 21).
 7. The projection arrangement asclaimed in claim 6, characterized in that the imaging optics (5; 21)comprise an optical axis (OA1; OA3), that the light modulator (4; 27) islocated below a reference plane, in which said optical axis (OA1)extends, and that the image imaged by the imaging optics (5; 21) islocated above said reference plan.
 8. The projection-arrangement asclaimed in claim 7, characterized in that the luminous field (2) islocated above the reference plane.
 9. The projection arrangement asclaimed in any one of claims 1 to 8, characterized in that the lightmodulator (4; 27) comprises a tilting mirror matrix.
 10. The projectionarrangement as claimed in any one of claims 1 to 9, characterized inthat the light source (1) emits multicolor light, a color unit (26) isarranged between the imaging optics (5; 21) and the light modulator (4),a second light modulator (27) is arranged following the color unit (26),wherein it is possible to direct light from the luminous field (2) ontothe color unit (26) via the imaging optics (27) from which light thecolor unit (26) couples out light of a first color and directs it ontothe first light modulator (4) and couples out light of a second colorand directs it onto the second light modulator (27), wherein the lightmodulators (4; 27) modulate the light impinging on them in order togenerate one partial color image each, and the modulated light issuperimposed by the color unit (26) to form one common beam, whichimpinges on the imaging optics (21).
 11. The projection arrangement asclaimed in claim 10, characterized in that the projection arrangementfurther comprises a third light modulator arranged following the colorunit (26), said color unit (26) coupling out light of a third color fromthe light impinging on it and directing said light onto the third lightmodulator, which modulates the light impinging on it in order togenerate a third partial color image.
 12. The projection arrangement asclaimed in claim 11, characterized in that a red partial color image maybe generated using the first light modulator (4), a green partial colorimage may be generated using the second light modulator (26) and a bluepartial color image may be generated using the third light modulator.13. The projection arrangement as claimed in any one of claims 1 to 12,characterized in that the projection optics only comprise the imagingoptics (5).
 14. The projection arrangement as claimed in any one ofclaims 1 to 12, characterized in that the projection optics (21, 32)further comprise a projection unit (32) arranged following the imagingoptics (21).